ContainerView Inside ScrollView don't scroll in Swift 3 - ios

Question

I have example project on GitHub you can see on ->
https://github.com/LetSwiftDev/ContainerViewInsideScroll/tree/master
I have two, view controller, one is normal view controller named oneViewController second is twoViewController inside have UIScrollView and when I clicked OPEN TWO button going to twoViewController inside ContainerView but;
My twoViewController have different height size like 1500 and inside have scrollview and don't scroll to bottom? I didn't see middle side, bottom side labels.
How can I fix it?
Any idea?
Also my centerViewController codes under below. I'm controlling to past view controllers with centerViewController
import UIKit
open class centerViewController: UIViewController {
fileprivate weak var viewController : UIViewController!
fileprivate var containerViewObjects = Dictionary<String,UIViewController>()
open var currentViewController : UIViewController{
get {
return self.viewController
}
}
fileprivate var segueIdentifier : String!
#IBInspectable internal var startUp : String!
override open func viewDidLoad() {
super.viewDidLoad()
}
open override func viewDidAppear(_ animated: Bool) {
if let identifier = startUp{
segueIdentifierReceivedFromParent(identifier)
}
}
override open func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func segueIdentifierReceivedFromParent(_ identifier: String){
self.segueIdentifier = identifier
self.performSegue(withIdentifier: self.segueIdentifier, sender: nil)
}
override open func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == segueIdentifier{
if viewController != nil{
viewController.view.removeFromSuperview()
viewController = nil
}
if ((self.containerViewObjects[self.segueIdentifier] == nil)){
viewController = segue.destination
self.containerViewObjects[self.segueIdentifier] = viewController
}else{
for (key, value) in self.containerViewObjects{
if key == self.segueIdentifier{
viewController = value
}
}
}
self.addChildViewController(viewController)
viewController.view.frame = CGRect(x: 0,y: 0, width: self.view.frame.width,height: self.view.frame.height)
self.view.addSubview(viewController.view)
viewController.didMove(toParentViewController: self)
}
}
}

Answer 1

Here is your demo with solution. You can download it from here
https://www.dropbox.com/s/zvrjd0gp06xe5nw/ContainerViewInsideScroll-master%202.zip?dl=0
The thing is You have to learn autolayout for Scrollview.
I am just giving tips for the given constraint to scrollview.
First take scrollview and fit to the screen and give constraint as follows
Now take a view inside scrollview and fit to scrollview and give constraint like
Still its giving error of constraint. So now, give equal width of view to scrollview
and now you can take as many control as you want and give constraints as normal as we give to other controls.
Hope you understand well.
Enjoy Coding.

Answer 2

The reason is that scrollView is too long and hidden below the screen and contentSize isn't configured properly.
A lazy solution is to set them properly in code when twoViewController appears.
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let width = self.scrollView.frame.width
scrollView.frame = CGRect(origin: scrollView.frame.origin,
size: CGSize(width: width, height: CGFloat(500)))
// Make sure this height is longer than scrollView.
scrollView.contentSize = CGSize(width: width, height: CGFloat(2000))
}
The proper solution (and correct way to implement a scrollview) is to fix scrollable content size ambiguity (auto layout errors in storyboard) like what #Jitendra Modi mentioned.